Abstrack:
Landscape degradation can be investigated by ecological risk assessment, which consists of landscape disturbance and fragility assessment. The fragility index is generally based on how likely it is for a class in a landscape to change, determined by expert judgment, and ordered as an integer. This study aims to identify land cover/land use in the Parangtritis coastal dune and classify it into anthropogenic impact classes, then assess the fragility index of each class. The method in this study is visual interpretation of small-format aerial photography in 2011 and 2020, followed by a field survey. The process of determining landscape fragility is carried out using a literature review and analytic hierarchy process (AHP). The study results show that there are 9 classes of anthropogenic impacts. The landscape fragility index from the largest are natural (1.000), agrogenic (0.686), industrogenic (0.472), tourism-sports (0.319), water management (0.215), tree agrogenic (0.145), traffic (0.098), info-telecommunication (0.068), and urbanogenic (0.048). Natural and agrogenic have the largest index because the changes from 2011 to 2020 show more extensive reductions, while urbanogenic has the lowest index because it tends to be permanent as a built-up area. The consistency ratio of the AHP result is 0.0754, meets the standard, and can be used in ecological risk assessment.
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